They also decided to experiment with various ways, like the time they were in the shower and Marty was about to enter Susan from behind when she reached around, took hold of his cock and said:"Not there," She said, referring to her pussy, "There!" As she placed the head of his prick against her asshole."Are you sure, Sue?" Marty asked, very surprised.In reply Susan pushed back against him and his cock slowly penetrated her extremely tight and reluctant anus. Susan winced as she continued pushing, harder and harder, trying to force her brother's large thick cock all the way into her. Marty held her hips and pushed forward, hard. His cock disappeared from view. Susan screamed in pain, but at least the worst was over.Susan knew Marty felt terrible, he'd never hurt her like that on purpose, so she reassured him:"It's-OK," she panted, the pain was slowly subsiding, but the heat was just starting to build.Susan bent far over, and Marty started to withdraw, very slowly. He looked down and. "Oh I hope this one's a good one."But just as he was about to erupt she shifted. In some small indefinable way that he never could figure out but just enough in exactly the wrong way so that instead of exploding, it was more like a damp firecracker. He could feel the cum shooting out but the accompanying orgasm was weak, muted ... dissatisfying.He relaxed and rolled off of her, his cock still semi-erect but it was over. He lay back on his side of the bed while she got up and slipped out to the bathroom. A feeling of frustration was growing in him. "Damn it all. Every time!" A small growl escaped his throat.But when she came back he kept silent. It wasn't any use anyway. Anytime he suggested something different she either acted like the silent martyr or outright refused. She mumbled something about the bathroom being free and slipped into bed. He lay there silently in the dark, staring at the invisible ceiling as her breathing slowed and soon soft snores began to fill the room..
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